3 phase isolation

[me1]

I am currently on a nc electrical course
i am struggling with the 10 steps required to perform a safe isolation
can anyone help with any links or suggestions?

I get so far E - L1 L2 L3, N - L1 L2 L3, L1 then what?

 

[spark 68]

L1-N, L2-N, L3-N, L1-L2, L1-L3, L2-L3, L1-E, L2-E, L3-E, N-E

Bloody auto format

 

[overskilled]

I'm developing a migraine from hell here so might be talking nonsense but I'd say
L1 -L2 L3
L2 -L3
N-E

 

[Simonslimline]

The way we were taught in college was....

Neutral-L1-L2-L3

Neutral-Earth

Earth-L1-L2-L3

L1-L2-L3

L2-L3

 

[me1]

L1-N, L2-N, L3-N, L1-L2, L1-L3, L2-L3, L1-E, L2-E, L3-E, N-E



So would I start with L1-N and not L1 - E

 

[spark 68]

I usually prefer to keep one of the probes of my VI to either N or E, whilst transferring the other one to the Ls, obviously you cannot do your phase-phase measurements this way.

I don't really suppose it makes much difference other than it is easier to keep track of what you have done, and that you do them all.

 

[Simonslimline]

Also obviously not forgetting to prove your tester before and after the sequence.

 

[Mark6098]

http://www.esc.org.uk/fileadmin/user_upload/documents/industry/best_practice/BPG2_09.pdf


Try that mate.

 

[telectrix]

all too complicated. just use a neon driver.:behead:

 

[ChrisElectrical88]

So long as you do them all the order doesn't matter as it should all be dead anyway

 

[Andy78]

Waving a voltstick in a circular motion should cover all the terminals. You need to vary the size of the circle sending on the size of DB and positioning of terminals.

 

[telectrix]

Waving a voltstick in a circular motion should cover all the terminals. You need to vary the size of the circle sending on the size of DB and positioning of terminals.

a bit more high tech than my method, but fine till you get dizzy.

 

[telectrix]

if you move the voltstick fast enough, say 3000 rpm, then it should tell you the phase rotation. :lol:

 

[overskilled]

Nah a neon lacks....granularity...what you need is 3 apprentices for 3 phase and one for single phase, if they get a jolt...its live....better try another breaker then (note on large installations you may need a large supply of "apprentices" due to "attrition"..the local job centre is recommended)
If no fatalities, smoke, flames, then repeat test with wet fingers just to make sure....